Ok here's my setup 55gal 1 aquaclear 70 and a aqueon 50 adding a canister soon I have 3 Bala sharks 2 clown loaches 3 yellow labs 4 other cichlids can't remember the name they're a blue with black stripes and yellow on the dorsal fin and 2 koi angels my ph stays steady at 6.8-7.0 I know the cichlids like a higher ph I've done all kinds of research some say keep ph high some say the fish will adapt to it so my question is how much of a factor is the pH and if I pit crushed coral in a media bag and hung it in the tank would that help raise it?